// Hide Header on on scroll down
var didScroll;
var lastScrollTop = 0;
var delta = 5;
var navbarHeight = $('nav').outerHeight();

$(window).scroll(function(event) {
    didScroll = true;
});

setInterval(function() {
    if (didScroll) {
        hasScrolled();
        didScroll = false;
    }
}, 250);

function hasScrolled() {
    var st = $(this).scrollTop();

    // Make sure they scroll more than delta
    if (Math.abs(lastScrollTop - st) <= delta)
        return;

    // If they scrolled down and are past the navbar, add class .nav-up.
    // This is necessary so you never see what is "behind" the navbar.
    if (st > lastScrollTop && st > navbarHeight) {
        // Scroll Down
        $('nav').removeClass('nav-down').addClass('nav-up');
    } else {
        // Scroll Up
        if (st + $(window).height() < $(document).height()) {
            $('nav').removeClass('nav-up').addClass('nav-down');
        }
    }

    lastScrollTop = st;
}

$(document).mouseup(function(e) {
    var container = $("#search-div");

    if (!container.is(e.target) // if the target of the click isn't the container...
        &&
        container.has(e.target).length === 0) // ... nor a descendant of the container
    {
        $("#search_results").hide();
    } else {
        if ($("#search-btn").is(e.target)) {
            $("#search_results").show();
        }
    }
});
